Friction gear



' Jan. 10,1928; 1,655,503 E. KNOLLER FRICTION GEAR Filed March 29, 1924 2 Sheets-Sheet 1 Patented Jan. 10, 1928. t

#ERIQHKNQLLER, or Vienna, AUSTRIA.

IRE-TEN ems.

. ,A mfionn a March 29,1924, S ria N9192389 ans.ines tfiaArti lQ 1e2 T s in ention re te t fr n g i n th o d nary forms o fr t gl a rml gr at i iffic lty is xperie ce n ta nin e oug pr ssure be e n r ving a d i rieti'o eleme ts s pr ven Sl ppin and .Q9nseqnen Wea Qn imp an obje o th P e in e "tion is to provide ajnovel form of friction gearing'wherein the different friction ele-' w l yth ueh thei pe ul i epw a rang m nt, a tomati a y P u e d qu pressure to prevent slipping 'ofsuoh {elements eeehf her- Another dif u ty it g i g f h d sc ription tha f allow ng 9 inequalities n th mac n ng o theg' ar d mm raeie i th i mountin s- I "A second important object of the invention is to provide an ilIipIfOY edffOIf IIi of-friction gearing wherein any such inequalit-ieswill' be a t qm jtical y compe ate In h a compa ying dr ngs l h esters of .re erenc indl at k P in the several views, nd; a

Figu e i s de ele a i n, Pa l S ,tionof one form of friction gearing asconstruct Lin e e daniq th his invention;

" igure 21 a sect n onthe ne +2 of .Figiire 4 a s F gur 31s a detai o ws w 0f th fric ion d ks and n i e in p a the idler being shown in one position in full.

lin s a di ase sn positi dotted n 1 Figure tie "a edge view of the details showntliigurefi- V Figure ,5 is a side elevation, partly insec- (of am d fi-ed .i m o e n t o Figure '6 is a section on theline 6 6 of Figure 5. o y gFrom inspeet-ion of Figures 1 and '2 it will heseen that t' -hereis provided a frame 10 wherein is mounted a shaft '11 which intended to revolve; under normal circumstances, :in the direction of the arrow-12 in Figure 2. Oni'this shaft 11 is fixedlymounted a member 13 having working faces provided' with opposed beveled circular portions 14. Parallel to theshaft 11 there is mounted a shaft 15 carrying a pair ofdisks 16 having confronting faces constituting the working faces of this structure. Either-of these shafts may be termed the driven shaft so that these shafts together with their disks constitute respectivelya drivingand-a driven element;-

Pos'itioned to one side of the-plane defined bythe axesof the shafts 11 and '15 is a shaft 17 whereonis slidably and rotatably mounted a pair of arms 1 8 and onthe treeend of each of these arms issupported a friction idler lg9 in the form of a' double frusto-conicztl roller. It is to be understood that the form of this idler may *be Varied "at will.

'Each pfthese idlersfis ,i'nterposedbetween cooperating working faces of the driving and driven elements and engages with th ebeve'ls 14. -Moreover,the shaft '17 is so positioned that rotation of .the disk '13 in the direction ,of the arrow tends to causethe friction idl'ers to seek what may he termed the high portions of the h'evels', those being the portions of the beveled element olosest the working faces of the other element. I

In order ,t-o use the device as achange speed gear there is provideda third shaft QO whereon is mounteda disk 21 having 0p- ;posed beveled working faces '22. Preferably "thisdisk' has the thickest portion of the bevel atits periphery. Llountedin a manner similarto the shaft17 is afshaft 23 whereon is pivotally and slidablly mounted a vpair of arms 24 eachcarrying atits free end a revolubly mounted friction idler 25 which engages with the bevels22 and the working faces of the disks 16. "Under "these circumstancesfthe shaft 15 is mounted ina sliding frame-26 which is slid ably supported on a rOdQT arried the main frame 10, suitable means (not shown) being provided {or shiftingthe frame on the shaftflf and holding it' in shifted position. "Such means are 011 Land well known and, as they form no specific part of the present invention are omitted from the showing.

- With this constructionfit will be'obvious that shifting'th'e frame 26 will vary the point ofengagement of the idlers 19am 25 therewith so 'that the shafts 11 and 20 are frictionally connected for variable speeds.

As-shown in. Figures 3 and ithe idlers 19 swing in an arc across the workingfaces of the {members '13 and, asjthey swing closer to "the center or axis of the member 113 they climb'the bevels 14 and are thus ioroedmore firmly against the working iacesfof the memhers 16. In fact, experience {has shown that 'ithegreater the resistance to the drive the may be termed a driving shaft and theiother greater will he the tendency of these mem- Moreover, due to *the fac t that th'e arms 18 disks 28 provided with beveled opposed Working faces 29.

A shaft supports a relatively thin disk 81 having opposed working faces which are interposed in part between the working faces 29 of the disks 28, and pairs of arms 32 support friction idlers 33, these arms being rotatably and slidably mounted on as in the former case. The shaft 85 is supported on a swinging frame 30 mounted on a shaft 36 from which extends an operating lever 37 provided with the usual latch 38 working over a common quadrant 39, this latch 38 and quadrant 39 being merely shown as indicating some suitable form of adjusting mechanism and not being specifically a part of this invention. Th operation in this case is exactly the same as in the other. The shaft 27 has its normal revolution in the clirect-ion of the arrow 40 and the idlers, in operation, tend to climb the bevels just as before.

Itis obvious that in some cases one of the s shafts 20 or 27 with its correspondingdisks and idlers may be omitted without departing from the spirit of the invention.

7 Having thus described the invention, what is claimed as new, is: V V

1; A friction gearing including driving and driven elements having parallel axes of rotation, one of said elements having a pair ,of working faces provided with opposed beveled circular portions, the other of sa1d elements also having a pair of working faces,

one of the elements having its working faces,

interposed in part between the working faces of the other element, friction idlers each interposed between the beveled portion of the respective working face of one element and a respective working face of the other ele- .ment, and means to pivotally support said idlers to permit them to swing across said worklng faces, the plvotal axis of said means a being positioned to one side of the plane in which the axes of said elements lies and so located that rotation of the driving element tends to cause the idlers to seek the portions ofthe bevels of one element closest the working faces of the other element.

2. A friction gearing including driving and l driven gear elements having parallel axes of rotation, a third gear element having its axis parallel to the axes of the first element at least one ofsaid elements having a pair of opposed beveled annular, working faces, the remaining elements each having a .ccentrically positioned shafts pair of opposed working faces, the working faces of each element overlapping the working faces of an adjacent element in spaced relation thereto, friction idlers each interposed between the beveled working faces and the working faces overlapping said beveled working faces and connecting adjacent gear elements, and means to pivotally support said idlers to permit them toswing across their engaged working faces, each pivotal means being positioned to one side of the plane in which the axes of the elements connected by said idlers lies and so located that rotation of the driving element tends tocause the idlers to seek the-portions of the bevels of one element closest the cooperating working faces of the adjacent element 3. A friction gearing including driving and driven gear elements having parallel axes of rotation, a third gear element having its axis parallel to the axes of the first element at least one-of said elements having a pair of opposed beveled annular working faces, the remaining elements each having a pair of opposed working faces, the working faces of each element overlapping the workfaces of an adjacent element in spaced relation thereto, friction idlers each interposed between the beveled working faces and the working faces overlapping'said beveled working faces and connecting adjacent gear elements, means to pivotally support said idlers to permit them to swing across their engaged working faces, each pivotal means being positioned to one side of the plane in which the axes of the elements connected by said idlers lies and soy located thatrotation of the driving element tends to cause the idlers to seek the portions of the bevels of one element closest the cooperating working faces of the adjacent element, one of said gear elements being disposed intermediate the other gear elements and engaged by all of said idlers, and means to shiftingly support the intermediate gear element arranged to permit movement of the axis of said element toward and from the axis of one of the remaining elements and from and toward the other of said. remaining elements.

4:. A friction gearing including a pair of co-axial spaced gear disks having their peripheral portions beveled on their confronting faces, a gear disk having its axis parallel to the first mentioned gear'disks and having an edge portion interposed between edge portionsofthe first disks, a pair of idler wheels interposed between the faces of the second mentioned gear disk and the beveled portions of the first mentioned gear disks, and arms supporting said idler wheels and pivoted'eccentrically of the axes of the gear disks and to one side of a plane COIl". t-ainingsaid axes, the pivot of said arms being so positioned that rotation of the gear disks in forward directions tends to cause the idlers to seek the proximal portions of the bevels on said gear disks.

5. In a friction gear, a pair of disk gears consisting of a driving gear and a driven gear, an intermediate disk gear mounted between the first gears to move toward and from the driving gear and from and toward the driven gear, the intermediate gear being displaced laterally of the other gears and having its periphery overlapping the peripheries of the other gears, idlers interposed between and engaging the overlapped peripheral portions of said gears, and supports for said idlers arranged to hold the idlers-yielding in position between the gears.

6. In a friction gear, a pair of disk gears consisting of a drivlng gear and a driven gear, an intermediate disk gear mounted between the first gears to move toward and from the driving gear and from and toward the driven gear, the intermediate gear being displaced laterally of the other gears and having its periphery overlapping the peripheries of the other gears, idlers interposed be tween and engaging the overlapping peripheral portions of said gears, arms carrying said idlers at one end, and pivotal 511131101135 for the remaining ends of said arms.

7. In. a friction gear, a pair of disk gears consisting of a driving gear and a driven gear, an intermediate disk gear mounted between the first gears to move toward and from the driving gear and from and toward the driven gear, the intermediate gear being displaced laterally of the other gears and having its periphery, overlapping the peripheries of the other gears, idlers interposed between and engaging the overlapping peripheral portions of said gears,the idler engaged portions of the pair of gears being beveled with the bevel of one gear reversely from the driving gear and from and toward the driven gear, the intermediate gear bein displaced laterally of the other gears and having its periphery overlapping the peri heries of the other gears, idlers interposed etween and engaging the overlapping peripheral portions of said gears, the 1dler 611- gaged portions of the pair of gears being beveled with the bevel of one gear reversely directed with respect to the bevel of the other gear, arms carrying said idlers at one end, andpivotal supports for the remaining 7 ends of said arms.

In testimony whereof I havesigned my name to this specification. i

. ING. DR. ER-ICH KNOLLER. 

